Applied Machine Learning
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1 Applied Spring 2018, CS 519 Prof. Liang Huang School of EECS Oregon State University
2 is Everywhere A breakthrough in machine learning would be worth ten Microsofts (Bill Gates) 2
3 AI subfields and breakthroughs Artificial Intelligence AI search data mining planning machine learning robotics information retrieval natural language processing (NLP) computer vision 3
4 AI subfields and breakthroughs Artificial Intelligence IBM Deep Blue, 1997 AI search (no learning) AI search data mining planning machine learning robotics information retrieval natural language processing (NLP) computer vision 3
5 AI subfields and breakthroughs Artificial Intelligence IBM Deep Blue, 1997 AI search (no learning) AI search data mining planning machine learning robotics information retrieval natural language processing (NLP) computer vision IBM Watson, 2011 NLP + very little ML 3
6 AI subfields and breakthroughs Artificial Intelligence IBM Deep Blue, 1997 AI search (no learning) AI search data mining planning information retrieval machine learning robotics natural language processing (NLP) computer vision IBM Watson, 2011 NLP + very little ML Google DeepMind AlphaGo, 2017 deep reinforcement learning + AI search 3
7 AI subfields and breakthroughs Artificial Intelligence IBM Deep Blue, 1997 AI search (no learning) AI search data mining planning RL information retrieval machine learning robotics DL natural language processing (NLP) computer vision IBM Watson, 2011 NLP + very little ML Google DeepMind AlphaGo, 2017 deep reinforcement learning + AI search 3
8 The Future of Software Engineering See when AI comes, I ll be long gone (being replaced by autonomous cars) but the programmers in those companies will be too, by automatic program generators. --- an Uber driver to an ML prof Uber uses tons of AI/ML: route planning, speech/dialog, recommendation, etc. 4
9 Failures 5
10 Failures liang s rule: if you see X carefully in China, just don t do it. 5
11 Failures 6
12 Failures 7
13 Failures clear evidence that AI/ML is used in real life. 7
14 Part II: Basic Components of Algorithms; Different Types of Learning 8
15 What is = Automating Automation Getting computers to program themselves Let the data do the work instead! Traditional Programming I love Oregon rule-based translation ( ) Input Computer Program Output I love Oregon Input Output Computer Program (2003-now) 9
16 Magic? No, more like gardening Seeds = Algorithms Nutrients = Data Gardener = You Plants = Programs There is no better data than more data 10
17 ML in a Nutshell Tens of thousands of machine learning algorithms Hundreds new every year Every machine learning algorithm has three components: Representation Evaluation Optimization 11
18 Representation Separating Hyperplanes Support vectors Decision trees Sets of rules / Logic programs Instances (Nearest Neighbor) Graphical models (Bayes/Markov nets) Neural networks Model ensembles Etc. 12
19 Evaluation Accuracy Precision and recall Squared error Likelihood Posterior probability Cost / Utility Margin Entropy K-L divergence Etc. 13
20 Optimization Combinatorial optimization E.g.: Greedy search, Dynamic programming Convex optimization E.g.: Gradient descent, Coordinate descent Constrained optimization E.g.: Linear programming, Quadratic programming 14
21 Gradient Descent if learning rate is too small, it ll converge very slowly if learning rate is too big, it ll diverge 15
22 Types of Learning Supervised (inductive) learning Training data includes desired outputs Unsupervised learning Training data does not include desired outputs Semi-supervised learning Training data includes a few desired outputs Reinforcement learning Rewards from sequence of actions cat cat dog dog rules white win 16
23 Supervised Learning Given examples (X, f(x)) for an unknown function f Find a good approximation of function f Discrete f(x): Classification (binary, multiclass, structured) Continuous f(x): Regression 17
24 When is Supervised Learning Useful when there is no human expert input x: bond graph for a new molecule output f(x): predicted binding strength to AIDS protease when humans can perform the task but can t describe it computer vision: face recognition, OCR where the desired function changes frequently stock price prediction, spam filtering where each user needs a customized function speech recognition, spam filtering 18
25 Supervised Learning: Classification input X: feature representation ( observation ) 19
26 Supervised Learning: Classification input X: feature representation ( observation ) (not a good feature) 19
27 Supervised Learning: Classification input X: feature representation ( observation ) (not a good feature) (a good feature) 19
28 Supervised Learning: Classification input X: feature representation ( observation ) (not a good feature) (a good feature) 19
29 Supervised Learning: Classification input X: feature representation ( observation ) 20
30 Supervised Learning: Regression linear and non-linear regression overfitting and underfitting (same as in classification) 21
31 What We ll Cover Supervised learning Nearest Neighbors (week 1) Linear Classification (Perceptron and Extensions) (weeks 2-3) Support Vector Machines (weeks 4-5) Kernel Methods (week 5) Structured Prediction (weeks 7-8) Neural Networks and Deep Learning (week 10) Unsupervised learning (week 9) Clustering (k-means, EM) Dimensionality reduction (PCA etc.) 22
32 Part III: Training, Test, and Generalization Errors; Underfitting and Overfitting; Methods to Prevent Overfitting; Cross-Validation and Leave-One-Out 23
33 Training, Test, & Generalization Errors in general, as training progresses, training error decreases test error initially decreases, but eventually increases! at that point, the model has overfit to the training data (memorizes noise or outliers) but in reality, you don t know the test data a priori ( blind-test ) generalization error: error on previously unseen data expectation of test error assuming a test data distribution often use a held-out set to simulate test error and do early stopping 24
34 Under/Over-fitting due to Model underfitting / overfitting occurs due to under/over-training (last slide) underfitting / overfitting also occurs because of model complexity underfitting due to oversimplified model ( as simple as possible, but not simpler! ) overfitting due to overcomplicated model (memorizes noise or outliers in data!) extreme case: the model memorizes the training data, but no generalization! underfitting underfitting underfitting (model complexity) overfitting overfitting 25
35 Ways to Prevent Overfitting use held-out training data to simulate test data (early stopping) reserve a small subset of training data as development set (aka validation set, dev set, etc) regularization (explicit control of model complexity) more training data (overfitting is more likely on small data) assuming same model complexity polynomials of degree 9 26
36 Leave-One-Out Cross-Validation what s the best held-out set? random? what if not representative? what if we use every subset in turn? leave-one-out cross-validation train on all but the last sample, test on the last; etc. average the validation errors or divide data into N folds, train on folds 1..(N-1), test on fold N; etc. this is the best approximation of generalization error 27
37 Part IV: k-nearest Neighbor Classifier 28
38 Nearest Neighbor Classifier assign label of test example according to the majority of the closest neighbors in training set extremely simple: no training procedure! 1-NN: extreme overfitting; k-nn is better as k increases, the boundaries become smoother k=+? majority vote (extreme underfitting) k=1: red k=3: red k=5: blue 29
39 Quiz Question what are the leave-one-out cross-validation errors for the following data set, using 1-NN and 3-NN? 30
40 Quiz Question what are the leave-one-out cross-validation errors for the following data set, using 1-NN and 3-NN? Ans: 1-NN: 5/10; 3-NN: 1/10 30
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